<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div>
        <div style="display: inline-block" v-for="item in arr">
          <input type="checkbox" v-model="list" :value="item" />
          <span>{{ item }}</span>
        </div>
        <p>你选中的元素, 累加的值和为: {{ add }}</p>
      </div>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
          list: [],
        },
        computed: {
          add() {
            return this.list.reduce((pre, cur) => pre + cur, 0);
          },
        },
      });
    </script>
  </body>
</html>
